# std::modulus<void>

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< cpp‎ | utility‎ | functional

Defined in header `<functional>` |  |
template<> class modulus<void>; |  | (since C++14)

std::modulus<void> is a specialization of std::modulus with parameter and return type deduced.

### Nested types

Nested type | Definition
`is_transparent` | unspecified

### Member functions

operator() | returns the modulus of two arguments (public member function)

## std::modulus<void>::operator()

template< class T, class U > constexpr auto operator()( T&& lhs, U&& rhs ) const -> decltype(std::forward<T>(lhs) % std::forward<U>(rhs)); |  |

Returns the remainder of the division of lhs by rhs.

### Parameters

lhs, rhs | - | values to divide

### Return value

std::forward<T>(lhs) % std::forward<U>(rhs).

### Example

Run this code

    #include <functional>
    #include <iostream>

    struct M
    {
        M(int x) { std::cout << "M(" << x << ");\n"; }
        M() {}
    };

    auto operator%(M, M) { std::cout << "operator%(M, M);\n"; return M{}; }
    auto operator%(M, int) { std::cout << "operator%(M, int);\n"; return M{}; }
    auto operator%(int, M) { std::cout << "operator%(int, M);\n"; return M{}; }

    int main()
    {
        M m;

        // 42 is converted into a temporary object M{42}
        std::modulus<M>{}(m, 42);    // calls operator%(M, M)

        // no temporary object
        std::modulus<void>{}(m, 42); // calls operator%(M, int)
        std::modulus<void>{}(42, m); // calls operator%(int, M)
    }

Output:

    M(42);
    operator%(M, M);
    operator%(M, int);
    operator%(int, M);

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